Author: Vincent Diepeveen
Date: 17:45:28 04/27/04
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On April 27, 2004 at 15:06:29, Gerd Isenberg wrote: >On April 27, 2004 at 03:33:26, Bas Hamstra wrote: > >>About double nullmove: I tested this in some pawnendgames to see if it could >>handle zuzwang problems, but I don't see it perform any better than normal >>nullmove. Can Vincent or you post a position where double null outperforms >>normal null? I agree the idea is elegant, but I just don't see it work. >> >>Bas. > > >Hi Bas, > >i don't use double nullmove, but a verification search with same R, if nullmove >fails high. Some of my favorite zugzwang positions: Seeing the zugzwang is easy here. Basically you want engines to see that the pawn endgame after the zugzwang is not a draw but is winning for black because it can create a passer that possibly runs faster than white ones. All you need here is 6 men EGTB, in which case even fullwidth will solve this easily. Of course double nullmove sees that zugzwang easily. So it is up to the program then whether it has 6 men whether it sees soon that the pawn endgame is a win. A good pawnendgame evaluation would help too :) >CTT4-11 Crafty-IsiChess: >[D] 8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - - ; bm Nxd5 >[D] 4KBkr/7p/6PP/4P3/8/3P1p2/8/8 w - - ; bm g7 >Cheers, >Gerd
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